Blood purification apparatus

Patent metadata

Field	Value
Publication number	US-10940252-B2
Application number	US-201715697873-A
Country	US
Kind code	B2
Filing date	Sep 7, 2017
Priority date	Mar 10, 2015
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

A blood purification apparatus with an arterial puncture needle or a venous puncture needle is stuck in the patient can be easily notified at the activation of a blood pump in an unconnected step. A blood purification apparatus includes a blood circuit for circulating blood, a dialyzer capable of purifying the blood, a blood pump provided to an arterial blood circuit for delivering a liquid, and a control device that executes a connected step in which the blood pump is activated when an arterial puncture needle (a) and a venous puncture needle (b) are in the patient and an unconnected step in which the blood pump is activated with neither the arterial puncture needle (a) nor the venous puncture needle (b) being stuck in the patient. The control device establishes, in the unconnected step, a restricted state where the behavior of the blood pump at the activation of the blood pump is restricted.

First claim

The invention claimed is:

1. A method comprising: connecting an arterial puncture needle to a distal end of an arterial blood circuit that is part of a blood circuit connecting a venous puncture needle to a distal end of a venous blood circuit that is part of the blood circuit, the blood circuit being capable of extracorporeally circulating blood of a patient; purifying the blood flowing through the blood circuit with a blood purification device provided between the arterial blood circuit and the venous blood circuit of the blood circuit; delivering liquid with a blood pump connected to the arterial blood when the blood pump is activated; introducing dialysate into the blood purification device through a dialysate introduction line; discharging the liquid from the blood purification device through a dialysate drain line; and executing a connected step with a control device in which the blood pump is activated when the control device senses that the arterial puncture needle and the venous puncture needle being stuck in the patient, executing an unconnected step in which the blood pump is activated when the control device senses that neither the arterial puncture needle nor the venous puncture needle being stuck in the patient, establishing with the control device, in the unconnected step, a restricted state where behavior of the blood pump at activation of the blood pump is restricted, and the control device establishes the restricted state only at the activation of the blood pump after transition from the connected step to the unconnected step; and executing a control step with the control device by switching between a blood-purification-treatment step, a returning step, and a draining step.

2. The method according to claim 1 , comprising operating the blood pump, in the restricted state, at a flow rate lower than a preset flow rate for a predetermined period of time or keeping the blood pump in a stopped state for a predetermined period of time.

3. The method according to claim 2 , comprising establishing, with the control device, the restricted state only at the activation of the blood pump after transition from the connected step to the unconnected step.

4. The method according to claim 1 , comprising performing a draining step in the unconnected step in which liquid in the blood circuit is discharged into the dialysate drain line after a blood purification treatment performed by the blood purification device or a returning step.

5. The method according to claim 1 , further comprising detecting venous pressure in the blood circuit with a venous air-trap chamber and a venous pressure sensor.

6. The method according to claim 5 , comprising monitoring liquid pressure in the venous blood circuit with the venous pressure sensor which is electrically connected to the control device.

7. The method according to claim 1 , comprising performing the unconnected step where a blood-checking device confirms that neither the arterial puncture needle nor the venous puncture needle is stuck in the patient.

8. The method according to claim 7 , comprising determining whether there is any blood flowing through the arterial blood circuit or the venous blood circuit with the blood-checking device, wherein the blood-checking device includes a light-emitting element and a light-receiving element located opposite one another to determine whether there is any blood flowing therebetween.

9. The method according to claim 1 , further comprising an air-bubble detection device located in an arterial blood circuit, a venous blood circuit, or both.

10. The method according to claim 9 , further comprising a detection switch disposed in an arterial blood circuit, a venous blood circuit, or both.

11. A method comprising: connecting an arterial puncture needle to a distal end of an arterial blood circuit that is part of a blood circuit, connecting a venous puncture needle to a distal end of a venous blood circuit that is part of the blood circuit, the blood circuit being capable of extracorporeally circulating blood of a patient; purifying the blood flowing through the blood circuit with a blood purification device provided between the arterial blood circuit and the venous blood circuit of the blood circuit; delivering liquid with a blood pump connected to the arterial blood circuit the blood pump is activated; executing a connected step with a control device in which the blood pump is activated the control device senses that the arterial puncture needle and the venous puncture needle are stuck in the patient, executing an unconnected step in which the blood pump is activated when the control device senses that neither the arterial puncture needle nor the venous puncture needle are stuck in the patient; and introducing dialysate into the blood purification device through a dialysate introduction line; discharging the liquid from the blood purification device through a dialysate drain line, wherein the unconnected step is a draining step in which liquid in the blood circuit is discharged into the dialysate drain line after a blood purification treatment performed by the blood purification device or a returning step; and establishing with the control device, in the unconnected step, a restricted state where behavior of the blood pump at activation of the blood pump is restricted, and the control device executes and controls step by switching from a blood-purification-treatment step, to the returning step, and then to the draining step; circulating the patient's blood extracorporeally through the blood circuit, while purifying the blood by the blood purification device in the blood-purification-treatment step; returning the blood in the blood circuit to the patient in the returning step; wherein the draining step discharges the liquid in the blood circuit to the dialysate drain line; and wherein the arterial puncture needle, the venous puncture needle, or both are stuck in the patient during the blood-purification-treatment step and the returning step and the arterial puncture needle, the venous puncture needle, or both are unconnected from the patient during the draining step.

12. The method according to claim 11 , comprising operating the blood pump wherein, in the restricted state, the blood pump is operated at a flow rate lower than a preset flow rate for a predetermined period of time or is kept in a stopped state for a predetermined period of time.

13. The method according to claim 12 , comprising establishing the restricted state with the control device only at the activation of the blood pump after transition from the connected step to the unconnected step.

14. The method according to claim 11 , comprising detecting venous pressure in the venous blood circuit with a venous air-trap chamber and a venous pressure sensor.

15. The method according to claim 14 , comprising monitoring liquid pressure in the venous blood circuit with the venous pressure sensor and wherein the venous pressure sensor is electrically connected to the control device.

16. The method according to claim 11 , comprising confirming with a blood-checking device that neither the arterial puncture needle nor the venous puncture needle is stuck in the patient in an unconnected step.

17. The method according to claim 16 , comprising determining whether there is any blood flowing through the arterial blood circuit or the venous blood circuit with the blood-checking device, wherein the blood-checking device includes a light-emitting element and a light-receiving element located opposite one another to determine whether there is any blood flowing through the arterial blood c

Assignees

• Nikkiso Co Ltd

Inventors

• Toyoda Masahiro
• Sugioka Akira

Classifications

• A61M1/1682 Primary

  both machine and membrane module, i.e. also the module blood side · CPC title

• A61M2205/331

  used as turbidity change detectors, e.g. for priming-blood or plasma-hemoglubine-interface detection · CPC title

• A61M2205/276

  preventing unwanted use · CPC title

• A61M2205/3306

  Optical measuring means · CPC title

• A61M1/3646

  Expelling the residual body fluid after use, e.g. back to the body · CPC title